Air filter



W. A. WOOD AIRFILTER March 20, 1934.

2l Sheets-Sheet 2 FiledMaIch 16, 1932 M M i l I ATTORNEYS Patented Mar. 20, 1934 AIR FILTER waiter A. wooo. neu-oit, Mich., signor to Handy Governor Corporation, Detroit, Mich., a corporation of Michigan Application Maren 1s, 1932, serial No. 599,209

11 claims. (ci. .isa-'13) This invention relates to an air lter such as may be employed with internal combustion engines used in automotive vehicles or for stationary work, and arranged so that the air which is utilized in the combustible mixture may pass therethrough and be cleaned. The desirability of and .advantages of a device for cleaning the air used by internal combustion engines are known to those versed in the art, so that it is not necesi0 sary herein to relate the desirability and ad-V vantages o1' air cleaning or iiltering devices in a general way.

The present invention is directed towards the provision of a device which may be more properly vlo termed an'air filter rather than an air `cleaner .and accordingly' it is so termed herein, but this terming of the device as a iilter is not to be construed as a limiting description.

Among the objects of the invention is the provision of an' improved air lter which provides a multiplicity of interstices through which the air passes as well as a method for making the lter. The filter of the present invention is one which may be employed with a substance such as oil or the like which is on the surface of the material .forming the interstices so that as the air passes therethrough, particles'of dust, dirt, or the like which may be in the air may be caught by the substance and retained, thus cleaning the air of such particles.

One oi the primary objects ofthe invention is the provision of an airlter wherein there is 'great uniformity in. the interstices, particularly a uniformity as to size. In'some air lters as have been heretofore proposed4 there is a likelihood of relatively large passageways forming in the substance designed to afford/small passageways for air to the end that large volumes ot air pass through the large passageways and the cleaning 4 0; action occurs only on the outer portions of the volume of air so that dust particles or the like are not removed from the center portions thereof. Furthermore, where a large air passageway is present, less resistance to air movement through the large passageway results in the greater proportion of the air passing through the large passageway with-aI smaller portion passing through the small interstices or passageways. The large passageways maybe formed during the manufacture of the devices or may form during use thereof,

In accordance with the present invention the air iilter is of such a construction and is so made that it is definitely known at the time of manufacture that there are no large passageways in illustrating the iiltering body.

the substance forming the body with the interstices, and the structure is also such that 'there is practically no likelihood of large passageways being. formed during the life and-use of the filter.

More specically the invention contemplates an air cleaner wherein the body forming the multiplicity of interstices is constituted 'by windings of stock-particularly, metal stock. One way of carrying out the invention is to form the ltering body by winding a long length of metal of wire or ribbon form and the length of material is preferably given an irregular shape so that adjacent windings cooperate to form small openings or interstices between themselves. As shown herein the metal stock is of ribbon form; that is 70 to say, a relatively thin and relatively wide strip.

Ihe invention and other objects will be better understood as the detail description progresses.

Fig. 1 is an end view with some parts cut away illustrating a iilter constructed' in accordance 75 twith the invention.

Fig. 2 is a side v iew with parts cut away and with parts in section.

Fig. 3 is a perspective view with parts cut away Fig. 4 is a detailed perspective showing one manner in which the strip may be irregularly formed.

Fig. 5 is a perspective view illustrating successive shapes of the strip as it is preferably formed i'or winding purposes. 2 Fig. 6 is a diagrammatic view in illustration of the method by which the filter is made.

Fig. 7 is a view illustrating a modified form.

The iilter may be constructed as illustrated in Figs. 1 and 2 wherein it will be seen that there is an end plate or disk y1 shaped with an oil'set 2 to provide a channel formation, the back wall of which is'at 3 with the other side of the channel as shown at 4, being constituted by the edge metal of the disk. A similar disk on the other end of the filter, is shown at 5; whereas the disk 1 may be substantially closed, the disk 5 may have an outlet apertureiormed as at 6. The .disk 5 is oiset as at 7 so that a channel formation is provided between this offset and the edge of the metal `9 connected' by a back for the channel as at 10. These two disks may form opposite ends of a cylindrically shaped filter, and a hollow body of ltering material may be held in position in. the opposing circularv channels of the two end disks. In the completed structure the end disks maybe held from separation by strips of wire or the like 11 passing fromone to the other with its ends passing through apertures in the disks 110 March 2o, 1934. w .5, WRIGHT 1,951,957

FRUIT PACKER Filed July 30, 1929 2 Sheets-Sheet l INVENTOR a/n 0. M1159@ Bye/7mm Z13 ATTORNEY 

